松嫩平原碱化草甸天然角碱蓬种群密度制约的分析

Analysis on Density Dependence to Natural Suaeda Corniculata Population in Alkaiization Meadow in the Songnen Plain of China

本文根据随机取样的测定数据,经过幂函数y=ax^(-b)、指数函数y=ae^(-bx)、变形双曲线函数y=a+b/x三种函数关系的回归分析与相关性比较测验,揭示了松嫩平原碱化草甸天然角碱蓬种群不同数量性状的密度制约规律。结果表明,角碱蓬种群在孕蕾期和籽实成熟期的平均植株重的密度制约模型均表现为幂函数或变形双曲线函数关系;平均植株籽实重及其种子数分别呈幂函数和变形双曲线函数关系;单位面积籽实重及其种子数均呈指数函数关系;地上生物量在孕蕾期尚未产生密度制约作用,而在籽实成熟期则表现为幂函数的制约关系。

Suaeda corniculata is an annual herb of Chenopodiaceae which is more alkali tolerance. According to the measurement data by random sampling, rule of density dependence of different quantitative characters on natural population of S. Corniculata in alkalization meadow in the Songnen Plain of China after both regression analysis and the significance test among correlation coefficient of three functions which are power function y=ax^(-b), exponential function y=ae^(-bx) and variate hyperbola function y=a+b/x were revealed in this paper. The results showed that the models of the density dependence were represented by power function or variate hyperbola function on mean weight per plant of the population both in the booting stage and in the ripening stage, variate hyperbola function on the mean number of seeds per plant, exponentral funetion on the fruits weight per unit area and the seeds number per unit area, and power function on the mean weight of fruits per plant and the above--ground biomass in the ripening stage. But the density dependence on the above--ground biomass was not brought about in the booting stage.